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A Feed-forward Microsecond Level Real-time SOP Finding System  

Jung, Hyun-Soo (명지대학교 통신공학과 광통신연구실)
Shin, Seo-Yong (명지대학교 통신공학과 광통신연구실)
Abstract
In this paper, we introduce a real-time state-of-polarization(SOP) finding system. The system divides the optical wave into linear horizontal- and vertical-SOP components and measures two different beat-signals, which are produced by superposition with reference optical source, in time domain. From these measured beat signals we can get SOP information of the signal instantly. Since the proposed scheme is a feed-forward measurement system, comparing with conventional systems which require an optical feedback loop, the measurement time becomes reduced tremendously. We also introduced a novel calibration method for compensating birefringence-related errors which may occur during the measurement. We prove the operation and performance of the proposed system through computer simulation and actual experiments.
Keywords
State of polarization; Stokes parameter; Jones vector; Polarization mode dispersion;
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